#! /bin/sh
#
# smartmontools drive database update script
#
# Home page of code is: https://www.smartmontools.org
#
# Copyright (C) 2010-22 Christian Franke
#
# SPDX-License-Identifier: GPL-2.0-or-later
#
# $Id$
#

set -e

# Set by config.status
@ENABLE_SCRIPTPATH_TRUE@export PATH="@scriptpath@"
PACKAGE="@PACKAGE@"
VERSION="@VERSION@"
prefix="@prefix@"
exec_prefix="@exec_prefix@"
sbindir="@sbindir@"
datarootdir="@datarootdir@"
datadir="@datadir@"
localstatedir="@localstatedir@"
drivedbinstdir="@drivedbinstdir@"
drivedbdir="@drivedbdir@"

# Download tools
os_dltools="@os_dltools@"

# Default drivedb.h update branch
default_branch="@DRIVEDB_BRANCH@"

# Default drivedb location
default_drivedb="$drivedbdir/drivedb.h"

# GnuPG used to verify signature (disabled if empty)
gpg="@gnupg@"

# Default command used for syntax check
default_smartctl="$sbindir/smartctl"

# PATH information for help and error messages
@ENABLE_SCRIPTPATH_FALSE@pathinfo='$PATH'
@ENABLE_SCRIPTPATH_TRUE@pathinfo="'$PATH'"

myname=$0

print_help()
{
@ENABLE_SCRIPTPATH_TRUE@  pathinfo="
@ENABLE_SCRIPTPATH_TRUE@                     $pathinfo"
  cat <<EOF
smartmontools $VERSION drive database update script

Usage: $myname [OPTIONS] [DESTFILE]

  -s, --smartctl SMARTCTL
                    Use SMARTCTL for syntax check ('-s -' to disable)
                    [default: $default_smartctl]
  -t, --tool [DIR/]TOOL
                    Use TOOL for download: $os_dltools
                    [default: first one found in $pathinfo]
  -u, --url-of LOCATION
                    Use URL of LOCATION for download:
                      github (GitHub mirror of SVN repository)
                      sf (Sourceforge code browser)
                      svn (SVN repository) [default]
                      svni (SVN repository via HTTP instead of HTTPS)
                      trac (Trac code browser)
  --url URL         Download from URL
  --file FILE       Copy from local FILE
EOF
  test "$drivedbinstdir" = "$drivedbdir" || cat <<EOF
  --install         Copy from originally installed drive database file
                    This is the same as:
                    '--no-verify --file $drivedbinstdir/drivedb.h'
EOF
  cat <<EOF
  --trunk           Download from SVN trunk (requires '--no-verify')
  --branch X.Y      Download from branches/RELEASE_X_Y_DRIVEDB
  --cacert FILE     Use CA certificates from FILE to verify the peer
  --capath DIR      Use CA certificate files from DIR to verify the peer
  --insecure        Don't abort download if certificate verification fails
  --no-verify       Don't verify signature
  --force           Allow downgrades
  --export-key      Print the OpenPGP/GPG public key block
  --dryrun          Print download commands only
  -q, --quiet       Suppress info messages
  -v, --verbose     Verbose output
  -h, --help        Print this help text

Updates $default_drivedb
or DESTFILE from branches/$default_branch of smartmontools
SVN repository.
EOF
}

error()
{
  echo "$myname: $*" >&2
  test -z "$usageerr" || echo "Try '$myname -h' for help" >&2
  exit 1
}

err_notfound()
{
  case $1 in
    */*) error "$1: not found $2" ;;
    *)   error "$1: not found in $pathinfo $2" ;;
  esac
}

# check_optarg "$@"
check_optarg()
{
  test $# -gt 1 || error "option '$1' requires an argument"
}

warning()
{
  echo "$myname: (Warning) $*" >&2
}

# selecturl URL_OF
selecturl()
{
  case $1 in
    github)  # https://github.com/smartmontools/smartmontools/raw/origin/$branch/smartmontools/drivedb.h
             # https://github.com/smartmontools/smartmontools/raw/master/smartmontools/drivedb.h
          # redirected to:
          url='https://raw.githubusercontent.com/smartmontools/smartmontools/master/smartmontools/drivedb.h' ;;
    sf)   url='https://sourceforge.net/p/smartmontools/code/HEAD/tree/trunk/smartmontools/drivedb.h?format=raw' ;;
    svn)  url='https://svn.code.sf.net/p/smartmontools/code/trunk/smartmontools/drivedb.h' ;;
    svni) url='http://svn.code.sf.net/p/smartmontools/code/trunk/smartmontools/drivedb.h' ;;
    trac) url='https://www.smartmontools.org/export/HEAD/trunk/smartmontools/drivedb.h' ;;
    *) error "$1: is none of 'github sf svn svni trac'"
  esac
}

inpath()
{
  local d rc save
  rc=1
  save=$IFS
  IFS=':'
  for d in $PATH; do
    test -f "$d/$1" || continue
    test -x "$d/$1" || continue
    rc=0
    break
  done
  IFS=$save
  return $rc
}

iecho()
{
  test -n "$quiet" || echo "$*"
}

vecho()
{
  test -n "$q" || echo "$*"
}

# vrun COMMAND ARGS...
vrun()
{
  if [ -n "$dryrun" ]; then
    echo "$*"
  elif [ -n "$q" ]; then
    "$@" 2>/dev/null
  else
    echo "$*"
    "$@"
  fi
}

# vrun2 OUTFILE COMMAND ARGS...
vrun2()
{
  local f err rc
  f=$1; shift
  rc=0
  if [ -n "$dryrun" ]; then
    echo "$* > $f"
  else
    vecho "$* > $f"
    err=`"$@" 2>&1 > $f` || rc=$?
    if [ -n "$err" ]; then
      vecho "$err" >&2
      test $rc != 0 || rc=42
    fi
  fi
  return $rc
}

# download URL FILE
download()
{
  local f u rc
  u=$1; f=$2
  rc=0

  case ${tool##*/} in
    curl*)
      # "Accept-Encoding" header avoids caching problems with svn URL
      vrun "$tool" ${q:+-s} -f --max-redirs 0 \
        -H "Accept-Encoding: identity" \
        ${cacert:+--cacert "$cacert"} \
        ${capath:+--capath "$capath"} \
        ${insecure:+--insecure} \
        -o "$f" "$u" || rc=$?
      ;;

    wget*)
      # wget >= 1.16.1 sets "Accept-Encoding: identity" header by default
      vrun "$tool" $q --max-redirect=0 \
        ${cacert:+--ca-certificate="$cacert"} \
        ${capath:+--ca-directory="$capath"} \
        ${insecure:+--no-check-certificate} \
        -O "$f" "$u" || rc=$?
      ;;

    lynx*)
      test -z "$cacert" || vrun export SSL_CERT_FILE="$cacert"
      test -z "$capath" || vrun export SSL_CERT_DIR="$capath"
      # Check also stderr as lynx does not return != 0 on HTTP error
      vrun2 "$f" "$tool" -stderr -noredir -source "$u" || rc=$?
      ;;

    svn*)
      vrun "$tool" $q export \
        --non-interactive --no-auth-cache \
        ${cacert:+--config-option "servers:global:ssl-trust-default-ca=no"} \
        ${cacert:+--config-option "servers:global:ssl-authority-files=$cacert"} \
        ${insecure:+--trust-server-cert} \
        "$u" "$f" || rc=$?
      ;;

    fetch*) # FreeBSD
      vrun "$tool" $q --no-redirect \
        ${cacert:+--ca-cert "$cacert"} \
        ${capath:+--ca-path "$capath"} \
        ${insecure:+--no-verify-hostname} \
        -o "$f" "$u" || rc=$?
      ;;

    ftp*) # OpenBSD
      vrun "$tool" \
        ${cacert:+-S cafile="$cacert"} \
        ${capath:+-S capath="$capath"} \
        ${insecure:+-S dont} \
        -o "$f" "$u" || rc=$?
      ;;

    *) error "$tool: unknown (internal error)" ;;
  esac
  return $rc
}

# check_file FILE FIRST_CHAR MIN_SIZE MAX_SIZE
check_file()
{
  local firstchar f maxsize minsize size
  f=$1; firstchar=$2; minsize=$3; maxsize=$4

  # Check first chars
  # shellcheck disable=SC2254
  case `dd if="$f" bs=1 count=1 2>/dev/null` in
    $firstchar) ;;
    \<) echo "HTML error message"; return 1 ;;
    *)   echo "unknown file contents"; return 1 ;;
  esac

  # Check file size
  size=`wc -c < "$f"`
  if test "$size" -lt $minsize; then
    echo "too small file size $size bytes"
    return 1
  fi
  if test "$size" -gt $maxsize; then
    echo "too large file size $size bytes"
    return 1
  fi
  return 0
}

# unexpand_svn_id < INFILE > OUTFILE
unexpand_svn_id()
{
  sed 's,\$''Id'': drivedb\.h [0-9][0-9]* 2[-0-9]* [012][:0-9]*Z [a-z][a-z0-9]* \$,$''Id''$,'
}

# selectkey BRANCH
selectkey()
{
  case $1 in
    RELEASE_5_4[0-3]_DRIVEDB|RELEASE_6_[0-6]_DRIVEDB)
# Smartmontools Signing Key (ext. to 2024) <smartmontools-database@listi.jpberlin.de>
# Smartmontools Signing Key (through 2018) <smartmontools-database@listi.jpberlin.de>
# Smartmontools Signing Key (through 2018) <smartmontools-database@lists.sourceforge.net>
# Key ID DFD22559
public_key="\
-----BEGIN PGP PUBLIC KEY BLOCK-----

mQENBFgOYoEBCAC93841SlFmpp6640hKUvZ8PbZR6OGnZnMXD6QRVzpibXGZXUDB
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1TC5jSVOIEqOE4TwzRz1Y/dfqSU=
=3Lcg
-----END PGP PUBLIC KEY BLOCK-----
"
      ;;

    RELEASE_7_[0235]_DRIVEDB)
# Smartmontools Signing Key (through 2025) <smartmontools-database@listi.jpberlin.de>
# Smartmontools Signing Key (through 2020) <smartmontools-database@listi.jpberlin.de>
# Key ID 721042C5
public_key="\
-----BEGIN PGP PUBLIC KEY BLOCK-----

mQINBFwmhpUBEADRoOZaXq13MrqyAmbGe6FlHi6P9ujsT/SJGhTiAoN3W1X56Dbm
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=7MQk
-----END PGP PUBLIC KEY BLOCK-----
"
      ;;

    *) error "No known public key for branches/$1" ;;
  esac
}

# gpg_verify FILE.asc FILE
gpg_verify()
{
  local gnupgtmp i out rc

  # Create temp home dir
  gnupgtmp="$tmpdir/.gnupg.$$.tmp"
  rm -f -r "$gnupgtmp"
  mkdir "$gnupgtmp" || exit 1
  chmod 0700 "$gnupgtmp"

  # Import public key
  if ! out=`echo "$public_key" | "$gpg" --batch --no-tty --homedir="$gnupgtmp" --import 2>&1`; then
    echo "$out" >&2
    exit 1
  fi
  vecho "$out"

  # Verify
  rc=0
  out=`"$gpg" --batch --no-tty --homedir="$gnupgtmp" --verify "$1" "$2" </dev/null 2>&1` || rc=1
  if [ $rc = 0 ]; then
    vecho "$out"
  else
    # print gpg error always
    echo "$out" >&2
  fi

  # Stop the gpg-agent possibly started by gpg
  if [ -n "$gpgconf" ]; then
    out=`"$gpgconf" --homedir="$gnupgtmp" --kill gpg-agent </dev/null 2>&1` || echo "$out" >&2
  fi

  # Remove temp home dir, retry on failure
  i=0
  while ! out=`rm -f -r "$gnupgtmp" 2>&1`; do
    i=$((i+1))
    if [ $i -ge 10 ]; then
      echo "$out" >&2; break
    fi
    vecho "$out"
    sleep 1
  done

  return $rc
}

# get_db_version DRIVEDB > VERSION
get_db_version()
{
  local r v x
  x=`sed -n '/^[ {]*"VERSION: *[^"]*"/{
       s,^[ {]*"VERSION: \([1-9][./0-9]* [^"]*\)".*$,\1,p
       q
     }' "$1"` || return 1
  v=${x%% *}
  test -n "$v" || return 0
  if [ "${v%/*}" = "$v" ]; then # trunk: get rev from expanded SVN-Id
    r=`echo "$x" | sed -n 's,^[^$]*\$''Id: drivedb\.h \([1-9][0-9]*\) .*$,\1,p'`
    test -n "$r" || r="?"
    v="$v/$r"
  fi
  echo "$v"
}

# mv_all PREFIX OLD NEW
mv_all()
{
  mv -f "${1}${2}" "${1}${3}" && \
  mv -f "${1}${2}.raw" "${1}${3}.raw" && \
  if [ -f "${1}${2}.raw.asc" ]; then
    mv -f "${1}${2}.raw.asc" "${1}${3}.raw.asc"
  else
    rm -f "${1}${3}.raw.asc"
  fi
}

# Parse options
smartctl=$default_smartctl
tool=
url_of=
url=
file=
quiet=
q="-q"
dryrun=
trunk=
branch=$default_branch
cacert=
capath=
insecure=
no_verify=
force=
expkey=
usageerr=t

while true; do case $1 in
  -s|--smartctl)
    check_optarg "$@"; shift
    smartctl=$1 ;;

  -t|--tool)
    check_optarg "$@"; shift
    tool=$1 ;;

  -u|--url-of)
    check_optarg "$@"; shift
    url_of=$1 ;;

  -q|--quiet)
    quiet=t ;;

  -v|--verbose)
    q= ;;

  --url)
    check_optarg "$@"; shift
    url=$1 ;;

  --file)
    check_optarg "$@"; shift
    file=$1 ;;

  --install)
    test "$drivedbinstdir" != "$drivedbdir" \
    || error "'$1' is not supported in this configuration"
    file="$drivedbinstdir/drivedb.h"
    no_verify=t ;;

  --dryrun)
    dryrun=t ;;

  --trunk)
    trunk=t ;;

  --branch)
    check_optarg "$@"; shift
    branch=`echo "$1" | sed -n 's,^\([567]\)\.\([0-9][0-9]*\)$,RELEASE_\1_\2_DRIVEDB,p'`
    test -n "$branch" || error "invalid branch version '$1'" ;;

  --cacert)
    check_optarg "$@"; shift
    cacert=$1 ;;

  --capath)
    check_optarg "$@"; shift
    capath=$1 ;;

  --insecure)
    insecure=t ;;

  --no-verify)
    no_verify=t ;;

  --force)
    force=t ;;

  --export-key)
    expkey=t ;;

  -h|--help)
    print_help
    exit 0 ;;

  -*)
    error "unknown option '$1'" ;;

  *)
    break ;;
esac; shift; done

if [ -n "$expkey" ]; then
  selectkey "$branch"
  cat <<EOF
$public_key
EOF
  exit 0
fi

case $# in
  0) drivedb=$default_drivedb ;;
  1) drivedb=$1 ;;
  *) error "only one DESTFILE argument is allowed" ;;
esac

# Check selected source
case "${url_of:+url_of}${url:+url}${file:+file}" in
  ''|url_of)
    test -n "$url_of" || url_of=svn
    selecturl "$url_of"
    if [ -z "$trunk" ]; then # select branch
      url=`echo "$url" | sed -e "s,/trunk/,/branches/$branch/," \
                             -e "s,/master/,/origin/$branch/,"`
    elif [ -z "$no_verify" ]; then
      error "'--trunk' requires '--no-verify'"
    fi ;;
  url)
    test -z "`echo "$url" | sed -e 's,^[a-z][a-z0-9]*:[^ ][^ ]*$,,'`" \
    || error "$url: Invalid URL" ;;
  file) ;;
  *) error "only one of '-u', '--url', '--file' is allowed" ;;
esac

# Determine path of signature file
file_asc=
url_asc=
if [ -z "$no_verify" ]; then case $url in
  '')   file_asc="$file.raw.asc" ;;
  *\?*) url_asc=`echo "$url" | sed 's,?,.raw.asc?,'` ;;
  *)    url_asc="$url.raw.asc" ;;
esac; fi

if [ -z "$file" ]; then
  if [ -z "$tool" ]; then
    # Find download tool in PATH
    for t in $os_dltools; do
      if inpath "$t"; then
        tool=$t
        break
      fi
    done
    test -n "$tool" || error "found none of '$os_dltools' in $pathinfo"
  else
    # Check tool name
    found=
    for t in $os_dltools; do
      case ${tool##*/} in
        $t*) found=t; break ;;
      esac
    done
    test -n "$found" || error "$tool: is none of '$os_dltools'"
  fi
fi

# Check option compatibility
case "$tool:$url_of" in
  svn:svn*) ;;
  svn:*) error "'-t svn' requires '-u svn' or '-u svni'" ;;
esac
case "$tool:${capath:+set}" in
  svn:set) warning "'--capath' is ignored if '-t svn' is used" ;;
esac
case "$url_of:$insecure" in
  svni:t) insecure= ;;
  svni:*) error "'-u svni' requires '--insecure'" ;;
esac
case "$tool:$insecure" in
  lynx:t) warning "'--insecure' is ignored if '-t lynx' is used" ;;
esac

# Check for smartctl
if [ "$smartctl" != "-" ]; then
  "$smartctl" -V >/dev/null 2>&1 \
  || err_notfound "$smartctl" "('-s -' to ignore)"
fi

# Check for GnuPG
gpgconf=
if [ -z "$no_verify" ]; then
  test -n "$gpg" \
  || error "GnuPG is not available ('--no-verify' to ignore)"
  "$gpg" --version >/dev/null 2>&1 \
  || err_notfound "$gpg" "('--no-verify' to ignore)"
  selectkey "$branch"
  case $gpg in
    */*) gpgconf="${gpg%/*}/gpgconf" ;;
    *) gpgconf="gpgconf" ;;
  esac
  "$gpgconf" --version >/dev/null 2>&1 || gpgconf=
fi
usageerr=

# Use destination directory as temp directory for gpg
tmpdir=`dirname "$drivedb"`

# Remove possible garbage from last download
test -n "$dryrun" || rm -f "$drivedb.new" "$drivedb.new.raw" "$drivedb.new.raw.asc" || exit 1

if [ -n "$url" ]; then
  # Download
  vecho "Download drivedb.h with $tool"
  rc=0
  download "$url" "$drivedb.new" || rc=$?
  if [ $rc != 0 ]; then
    rm -f "$drivedb.new"
    error "drivedb.h: download failed ($tool: exit $rc)"
  fi

  if [ -n "$url_asc" ]; then
    vecho "Download drivedb.h.raw.asc with $tool"
    rc=0
    download "$url_asc" "$drivedb.new.raw.asc" || rc=$?
    if [ $rc != 0 ]; then
      rm -f "$drivedb.new" "$drivedb.new.raw.asc"
      error "drivedb.h.raw.asc: download failed ($tool: exit $rc) ('--no-verify' to ignore)"
    fi
  fi
else
  # Copy from local file
  if [ ! -f "$file" ]; then
    error "$file: file not found"
  fi
  if [ -n "$file_asc" ] && [ ! -f "$file_asc" ]; then
    error "$file_asc: file not found ('--no-verify' to ignore)"
  fi

  if ! vrun cp "$file" "$drivedb.new"; then
    error "$file: copy failed"
  fi
  if [ -n "$file_asc" ]; then
    if ! vrun cp "$file_asc" "$drivedb.new.raw.asc"; then
      rm -f "$drivedb.new"
      error "$file_asc: copy failed"
    fi
  fi
fi

test -z "$dryrun" || exit 0

# Check files, adjust timestamps and permissions
if ! errmsg=`check_file "$drivedb.new" '/' 10000 1000000`; then
  rm -f "$drivedb.new.raw.asc"
  mv -f "$drivedb.new" "$drivedb.error"
  error "$drivedb.error: $errmsg"
fi
touch "$drivedb.new"
chmod 0644 "$drivedb.new"

if [ -f "$drivedb.new.raw.asc" ]; then
  if ! errmsg=`check_file "$drivedb.new.raw.asc" '-' 200 2000`; then
    rm -f "$drivedb.new"
    mv -f "$drivedb.new.raw.asc" "$drivedb.error.raw.asc"
    error "$drivedb.error.raw.asc: $errmsg"
  fi
  touch "$drivedb.new.raw.asc"
  chmod 0644 "$drivedb.new.raw.asc"
fi

# Create raw file with unexpanded SVN Id
# (This assumes newlines are LF and not CR/LF)
unexpand_svn_id < "$drivedb.new" > "$drivedb.new.raw"
chmod 0644 "$drivedb.new.raw"

# Check whether installed file is identical
equal=
if [ -f "$drivedb" ]; then
  if [ ! -f "$drivedb.raw" ]; then
    # Create missing raw file
    unexpand_svn_id < "$drivedb" > "$drivedb.raw"
    chmod 0644 "$drivedb.raw"
  fi
  # Ignore missing Id keyword expansion in new file
  if    cmp "$drivedb.raw" "$drivedb.new.raw" >/dev/null 2>&1 \
     && {   cmp "$drivedb"     "$drivedb.new" >/dev/null 2>&1 \
         || cmp "$drivedb.raw" "$drivedb.new" >/dev/null 2>&1; }
  then
    equal=t
  fi
fi

if [ -z "$no_verify" ]; then
  # Verify raw file
  if ! gpg_verify "$drivedb.new.raw.asc" "$drivedb.new.raw"; then
    mv_all "$drivedb" ".new" ".error"
    test -z "$equal" \
    || warning "$drivedb: *** installed file is identical to broken new file ***"
    error "$drivedb.error.raw: *** BAD signature or outdated key ***"
  fi
fi

# Get version
newver=`get_db_version "$drivedb.new"`
if [ -z "$newver" ]; then
  if [ -z "$force" ]; then
    mv_all "$drivedb" ".new" ".error"
    error "$drivedb.error: no VERSION information found ('--force' to ignore)"
  fi
  newver="?/?"
elif [ "${newver##*/}" = "?" ]; then
  if [ -z "$trunk" ]; then
    mv_all "$drivedb" ".new" ".error"
    error "$drivedb.error: VERSION information is incomplete ('--trunk' to ignore)"
  fi
fi

if [ "$smartctl" != "-" ]; then
  # Check syntax
  if ! "$smartctl" -B "$drivedb.new" -P showall >/dev/null; then
    mv_all "$drivedb" ".new" ".error"
    error "$drivedb.error: rejected by $smartctl, probably no longer compatible"
  fi
  vecho "$smartctl: syntax OK"
fi

# Always install if missing
rm -f "$drivedb.lastcheck"
if [ ! -f "$drivedb" ]; then
  mv_all "$drivedb" ".new" ""
  iecho "$drivedb $newver newly installed${no_verify:+ (NOT VERIFIED)}"
  exit 0
fi

# Keep old file if identical
if [ -n "$equal" ]; then
  if    [ -f "$drivedb.new.raw.asc" ] \
     && ! cmp "$drivedb.new.raw.asc" "$drivedb.raw.asc" >/dev/null 2>&1; then
    mv -f "$drivedb.new.raw.asc" "$drivedb.raw.asc"
    iecho "$drivedb.raw.asc $newver updated"
  fi
  rm -f "$drivedb.new" "$drivedb.new.raw" "$drivedb.new.raw.asc"
  touch "$drivedb.lastcheck"
  iecho "$drivedb $newver is already up to date${no_verify:+ (NOT VERIFIED)}"
  exit 0
fi

# Check branch and file version
oldver=`get_db_version "$drivedb"`
test -n "$oldver" || oldver="?/?"
if    [ "${newver##*/}" = "?" ] \
   || [ "${oldver##*/}" = "?" ] \
   || [ "${newver%/*}" != "${oldver%/*}" ]; then
  # Always install from trunk or other branch
  updmsg="replaced with"
elif [ "${newver##*/}" -lt "${oldver##*/}" ]; then
  # Install older file only if '--force' is used
  if [ -z "$force" ]; then
    rm -f "$drivedb.new" "$drivedb.new.raw" "$drivedb.new.raw.asc"
    iecho "$drivedb $oldver not downgraded to $newver ('--force' to override)"
    exit 0
  fi
  updmsg="downgraded to"
else
  updmsg="updated to"
fi

mv_all "$drivedb" "" ".old"
mv_all "$drivedb" ".new" ""
iecho "$drivedb $oldver $updmsg $newver${no_verify:+ (NOT VERIFIED)}"
